Fix NullPointerException in supp service notify handler.

The TelephonyConnection handler for supp service notifications outputs
a log message which includes the phone ID.  I've seen an instance where
the phone is null, causing a crash.

Test: Manual
Bug: 62202366
Change-Id: I355b08b130413450cbf37bb8c7f87a2a894a5fe4
1 file changed